<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <!-- 渲染一级权限 -->
                        <el-row v-for="(item1, i1) in scope.row.children"
                        :key="item1.id" :class="['bdbottom', 'vcenter', i1 == 0 ? 'bdtop' : '']">
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item3.id)">{{item1.authName}}</el-tag>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 二级权限 -->
                                <el-row v-for="(item2, i2) in item1.children" :key="item2.id"
                                :class="['vcenter', i2 == 0 ? '' : 'bdtop']">
                                <el-col :span="6">
                                    <el-tag type="success" closable @close="removeRightById(scope.row,item3.id)">{{item2.authName}}</el-tag>
                                </el-col>
                                <!-- 三级权限 -->
                                <el-col :span="18">
                                    <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable
                                    @close="removeRightById(scope.row,item3.id)">
                                        {{item3.authName}}</el-tag>
                                </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting"
                        @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
        title="分配权限"
        :visible.sync="setRightDialogVisible"
        width="50%"
        @close="setRightDialogClosed">
        <!-- 树形控件 -->
        <el-tree :data="rightsList" :props="treeProps"
        @node-click="handleNodeClick" show-checkbox node-key="id"
        default-expand-all default-expanded-keys="defKeys"
        ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolesList: [],
            setRightDialogVisible: false,
            // 所有权限的数据
            rightsList: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authname',
                children: 'children'
            },
            // 默认选中的节点Id值数组
            defKeys: [],
            roleId: ''
        }
    },
    created() {
        this.getRoleslist()
    },
    methods: {
        async getRoleslist() {
            const { data:res } = await this.$http.get('roles')
            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败')
            }
            this.rolesList = res.data
        },
        // 根据Id删除对应的权限
        async removeRightById(role, rightId) {
            // 弹框提示用户是否要删除
            const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }
                ).catch(err => err)

                if(confirmResult !== 'confirm'){
                    return this.$message.info('取消了删除')
                }

                const { data:res } = this.$http.delete(`roles/${role.id}/rights/${rightId}`)
                if(res.meta.status !== 200){
                    return this.$message.error('删除权限失败')
                }
                role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            const { data:res } = this.$http.get('rights/tree')
            if(res.meta.status !== 200){
                return this.$message.error('获取权限数据失败')
            }
            // 把获取到的权限数据保存到 data 中
            this.rightslist = res.data
            console.log(this.rightslist)

            // 递归获取三级节点的Id
            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有的三级权限下的id，并保存到defKeys中
        getleafKeys(node, arr) {
            // 如果当前 node 节点不包含 children 属性，则是三级节点
            if(!node.children){
                return this.defKeys.push(node.id)
            }
            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
        this.defKeys = []
        },
        // 为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            const idStr = keys.jion(',')
            const { data:res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
            if (res.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>
<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>